﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    //燕子
    class Yz : Birds
    {
        public override void Csay()
        {
            base.Csay();
            Console.WriteLine("我是这样叫的，叽叽");
        }
    }
}
